Heel-compressing machine.



w. P. MILLS.

HEEL COMPRESSING MACHINE.

APPLICATION FILED APR. 7, I916.

' Patented Nov. 13,1917.

3 SHEETSSHEET 1.

W/ZM M W. P. MILLS.

HEEL COMPRESSING MACHINE. AFPLlCATION FILED APR. 1. 191a.

1,246,299. Patenmd Nov. 13, 191?.

3 SHEETS-SHEET 2.

w. P. MILLS. HEEL COMPRESSINGY MACHINE. APPLICATION FILED APR. 7| I916.

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N m R m m J. 7 n v \\\R Q m w m mm H Q m m ELK 1 MN W IL UNITED STATES PATENT OFFICE.

WILLIAM PHILIP MILLS, OF LEICESTER, ENGLAND, ASSIGNOR TO GIMSON & CO. (LEICESTER) LIMITED, OE LEICESTER, ENGLAND, A CORPORATION OF GREAT BRITAIN.

HEEL-COMPRESSING- MACHINE.

Specification of Letters Patent. Patented Nov, 13, 1917,

Application filed April 7, 1918. Serial No. 89,710.

at Leicester, in thecounty of Leicester, England, have invented certain new and useful Improvements in Heel-Compressing Machines, of which the following is a specification.

This invention relates to heel compressing and analogous machines such as are employed in the manufacture of boots. and. shoes.

The object of the invention is to provide heel compressing machines, top piece condensing machines and the like withv an improved arrangement of means for automatically yielding against excessive pressure. to prevent damage to the work and fracture of the machine.

Excessive pressure is likely to be engendered from various causes such for instance as variation in the height of the heels or in the thickness of the work operated upon, wrong adjustment of the machine in relation to the work, or displacement of the work in the mold.

In compressing heels and condensing toplifts it is highly desirable that in every case the maximum pressure should be applied to the work, and in order that. this pressurewhich is usually very heavy shall be utilized to obtain the desired. good results without fear of. damaging the machine or work, the improved relieving device the subject of the present invention has been designed.

vThe said pressure relieving means are so constructed. as to be capable of adjustment to yield at any pressure thus enabling the maximum pressure to be determined accord ing to the nature of the. Work or as circum, stances require.

In carryingthe invention into practical effect the toggle may. according to one arrangement, have operating in conjunction with it a spring the force of which. is directed against the. joint or center of. thetoggle; according to another arrangement the.- toggle may operate in conjunction with springs p suitahlerforgyielding; under; very heavy press.-

the forceof which. is. directed against the ends of the. toggle, with. or without; a further spring acting against the center-joint. The. first of. the arrangements just. mentioned is sures While the second arrangement is suit able for yielding; under lighter pressures.

The pressure relieving device is situated in the head or top of the machine frame and operates by allowing the heel seat die or member to yield against the opposing pressure of the beam thus obviating excessivepressure on the work or material situated between these parts.

In further describing'the invention ref erence will be made to the accompanying drawings wherein two concrete embodiments of the invention are illustrated by way of examples.

In the drawings referred to Figure 1 is a front elevation and Fig.- 2 is a vertical side section of the upper part or head of a heel compressing machine having the invention applied thereto.

Fig. 3 is a partly sectional front view and Fig. 4: is a partly sectional plan of the machine head fitted with an alternative form of the device.

Throughout the drawings like parts are designated by the same reference characters.

In the constructional form shown in Figs.- 1 and '2, a toggle composed of members 1 and" 2. is disposed in endwis'e relationship to the die 8 one end of the toggle being capableof pivotal movement about a stationary fulcrum 4 and the opposite end having. pivotal connection with a plunger 5 slid'able' in thei machine head: 6- and constructed to carry the die 3. Disposed at right angles to; the tog:- gle isa powerful compression spring'fwhich atone end takes bearing against a" screwed plug 8 or other screwed adjusting device in a boss 9 on. the back of the head, and at the opposite end presses. through the medium: of? a washer 1.0 or other COIIVBTHQHt interme-- diarv device,upon-. the center joint 11 ofv the toggle.

The downward movement of the" die 3 is restricted by two adjusting screws 12 int'he machine head 6' with which screws :1 shou l-" den 13 onztheplunger 5 makes contact. Thus the said screws. serve to determine the not mal position of the die. In its normal posi' tion, the-toggle '1, 2 is as shown slightly bent from. the straight. position in the: direc tiorr of the controlling. spring 7, and in' acition, abnormal pressure against the die; 3 causes an: upward movement oftherplungezry' 5 and .consequentincrease bead femibreak of the toggle which acts against the controlling spring.

The maximum pressure which this arrangement will withstand may be varied 5 either by means of the adjusting screws 12 which increase or decrease the approach of the toggle members to the straight position and so give an increased or decreased maximum pressure, or by means of the screwed plug 8 (or other device) which will vary the pressure of the controlling spring 7 upon the toggle. The latter method of varying the pressure admits of a finer adjustment than the former method, but both may-be l5 employed.

In the alternative arrangement shown in Figs. 3 and 4, the'die or pressing member 3 is mounted in a plunger 14 slidable in the machine head 6 and a toggle composed of members 15, 16 is disposed at right angles to said plunger which has pivotal connection or contactual engagement with the center joint 17. I

By means of an intermediate sliding member 18, each end 19 of the toggle is influenced by a powerful compression spring 20 arranged in the machine head 6, the outer ends of said springs having a bearing against a screwed plug 21 or other equivalent adjust-- ing means in the head or frame.

In this case the toggle is normally broken or bent in the direction of the die 3 as shown in Fig. 3, and execessive pressure against the latter causes upward movement of the plunger 14: which takes effect upon the toggle tending to straighten it and so compress the controlling springs 20. The lateral thrust of the ends 19 of the toggle may be taken by cheeks '22 in the machine head against which the said toggle ends bear and move. and to bend or break the toggle after straightening, a third spring 23 may be employed this acting against the center joint 17 of the toggle in a direction opposed to that in which the die plunger 14: atl'ects the joint. This third spring 23 mayor may not be sufficiently powerful to materially assist the controlling springs 20 in normally sustaining the die 3 against the maximum operative pressure of the machine and it is preferably arrangedin conjunction with a plunger rod 24 which at one end is pivotally connected to or has contactual engagement with the center joint 17 of the toggle while the other end is slidable within or through a hearing or hole 25 in the machine head 6. Suitable means (not I shown) may be provided for adjusting the pressure of this suplementary spring if necessary.

'In the last described arrangement adjusting screws in the frame such as the screws 12 (Fig. 1) may be used to determine the normal position of the pressing die, and

these screws and also the beforementioned screwed pigs 21 (or equivalent devices) may be employed in the aforesaid manner to vary the resistance of the yielding device. In both the concrete forms already described the members constituting the toggle are jointed to each other and to the contiguous parts about fulcrum pins in the known manner whereby very heavy pres sure may. be transmitted, and the movements of the toggle to and from the straight position may be restricted to reasonable limits by co-acting shoulders 26 on the tog gle members.

The pressing die or member 3 may be removably fastened in the plunger 5 or 14 by a screwed fastening device such as 27 (Figs. 1 and 2) or other means, and the members or partsS, 10, 18 and 21 with which the controlling springs operate may be furnished with shanks or bosses 28 to keep said springs in position in relation thereto. r

The machine frame or head'6 is preferably constructed to inclose the yielding device. a removable cover plate 29 (removed in Figs. 1 and 3) being fitted to give access through an opening 30 to said device when necessary. The housing for the device may, and preferably does form part of the machine frame casting 6 this having exposed bosses 9 and 31 to carry the spring adjusting plugs 8 and 21 so that these may be adjusted from the outside.

The arrangement of device illustrated in Figs. 1 and 2 is suitable for yielding under very heavy pressures while the arrangement illustrated in Figs. 3 and 4 is suitable foryielding under lighter pressures.

What I claim then is 1. In a heel compressing or analogous machine, in combination, a pressing-member, a slidable plunger carrying said member, a spring controlled toggle arranged to act upon the sliding plunger whereby the pressing member is sustained so as to resist the maximum pressure but to yield under pressure in excess of the maximum, and a shoulder on the plunger adapted to determine the normal position of the pressing member.

2. In a heel compressing or analogous machine, in combination, a pressing member, a slidable plunger'carrying said member, a. spring controlled toggle arranged to act upon the sliding plunger whereby the pressing member is sustained so as to resist the maximum pressure but to yield under pressure in excess of the maximum, a shoulder on the plunger, and adjustable devices to engage said shoulder to determine the normal position of the plunger.

3. In a heel compressing or analogous machine, in combination, a pressing member, a slidable plunger carrying said member, a. pair of links, a fulcrum, said links being pivotally connected together at one end, andat the opposite end pivotally connected to spectively to said plunger and fulcrum, a compression spring disposed at right angles to the pair of links and arranged so that its force is directed against their connected ends, a washer intermediate of one end of said spring and the joint of the links, an adjustable threaded member against which the opposite end of said spring bears, a shoulder on the plunger, and adjustable devices to engage said shoulder to determine 1) the normal position of the plunger, for the purpose described.

In testimony whereof I afiix my signature in presence of two Witnesses.

WILLIAM PHILIP MILLS. Witnesses:

E. N. LEWIS, GEORGE LESTER.

Copies of this patent may be obtained for five cents each, by addressing the commissioner of Patents, Washington, D. C. 

